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=== Opening a Port ===
 
=== Opening a Port ===
To allow a specific port access to your machine, you will (most likely) need to make IPTables ACCEPT traffic meeting the port criteria on the INPUT chain.
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To allow a specific port access to your machine, you will (most likely) need to make IPTables {{code|ACCEPT}} traffic meeting the port criteria on the {{code|INPUT}} chain.
  
 
Simple IPTables:
 
Simple IPTables:

Latest revision as of 14:04, 9 October 2019

Linux[edit]

Linux typically uses IPTables for its firewall. On most modern Linux distributions, IPTables is controlled through another program or manager such as firewalld, or CSF.

Opening a Port[edit]

To allow a specific port access to your machine, you will (most likely) need to make IPTables ACCEPT traffic meeting the port criteria on the INPUT chain.

Simple IPTables:

# iptables -A INPUT -p tcp --dport 80 -j ACCEPT

If using Red Hat's firewalld:

# firewall-cmd --permanent --add-port=80/tcp
# firewall-cmd --permanent --add-service=x
## Reload firewall rules
# firewall-cmd --reload

If using CSF:

# vi /etc/csf/csf.conf
## Edit 'TCP_IN' to include any TCP traffic IN, or TCP_OUT for traffic out.
## Reload CSF
# csf -r